Doesn’t seem to be a systemic problem, or anyway, there is not a huge incidence of such loglines - pretty much your account +2 (out of tens of thousands of middleman sites that get built each week), though I can see it just started. I wouldn’t expect it’s related directly to the contentful gem - it wouldn’t be gzipped on disk, so the Zlib::GzipFile error smells like something else… A link to the deploy’s log page would give us some useful context, but if you don’t feel like doing that, here’s some general questions to help you debug by yourself: